import java.util.Scanner;
public class MyDCTester  {
      public static void main (String[] args) {
          String expression, again;
          int result;
          try {
              Scanner in = new Scanner(System.in);
              do{
                  MyDC evaluator = new MyDC();
                  System.out.println ("Enter a valid postfix expression: ");
                  expression = in.nextLine();
                  result = evaluator.evaluate (expression);
                  System.out.println ("That expression equals " + result);
                  System.out.print ("Evaluate another expression [Y/N]? ");
                  again = in.nextLine();
                  System.out.println();
              }
              while (again.equalsIgnoreCase("y"));
          }
          catch (Exception IOException) {
              System.out.println("Input exception reported");
          }
      }
}
 